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In the catalytic cracking, what Is the catalyst used?

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In the catalytic cracking, what Is the catalyst used?

(a) Nacl

(b) Kcl

(c) ZnSO4

(d) Al2O3

I had been asked this question during an interview.

My question comes from Cracking and Knocking of Petroleum topic in section Fuel Technologies of Applied Chemistry

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Right answer is (d) Al2O3

To explain I would say: Al2O3 and also Al2(SiO3)3 acts as catalysts in catalytic cracking. Usage of these catalysts, the quality of petrol is high without any heating.

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